Explain how rubbing your eyes with dirty hands can lead to an infection in the nasal cavity
What will be an ideal response?
The eye and the nasal cavity are connected by a series of passages. Tears from the eyes can carry an infection through the lacrimal puncta, tiny holes in the medial edge of each eyelid. The puncta are continuous with the lacrimal canaliculi, small ducts that empty into the lacrimal sac. The lacrimal sacs are situated in a small depression in the lacrimal bone and drain tears into the nasolacrimal duct. The nasolacrimal duct travels through the lacrimal and maxillary bones into the inferior nasal meatus of the nasal cavity.
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What is the function of a catalyst in a chemical reaction?
A. It ensures that the reaction can proceed only in one direction, from reactants to products. B. It lowers the activation energy of the reaction. C. It is split into individual molecules that are products of the reaction. D. It generates heat that makes the reaction proceed. E. It changes the energy content of the reactants.
Atrial natriuretic peptide is a hormone that is made in the atria of the heart. The influence of this hormone is to ________.
A) enhance atrial contractions B) activate the renin-angiotensin mechanism C) prevent pH changes caused by organic acid D) reduce blood pressure and blood volume by inhibiting sodium and water retention
In an intact cadaver, what structure(s) would be nestled into and protected by the sella turcica?
A. The pterygoid muscles B. The pituitary gland C. The pineal gland D. The olfactory bulbs E. The optic nerves
The sarcomere is called the basic functional unit of a muscle fiber because it is the smallest part of the fiber that is capable of _____.
Fill in the blank(s) with correct word.